Characterization and structural studies of lithium doped lead zinc phosphate glass system

Glasses in the system (PbO)30(P2O5)40(ZnO)30−x(Li2O)x (where x = 0, 15, 20, 25, 30 mol%) and (PbO)30(P2O5)50(ZnO)20−x(Li2O)x (where x = 0, 5, 10, 15, 20 mol%) were prepared by conventional melt quenching technique. XRD and DSC measurements were performed to confirm their amorphous nature. Thermal stability factor (S) has been evaluated using the values of Tg and Tc. The refractive indices of these glasses lie in the range of 1.40–1.45. IR spectra of these glasses show absorption peaks in the range 1233–1247 cm−1, 1076–1087 cm−1, 905–894 cm−1, 735–731 cm−1 and 531–556 cm−1 corresponding to Pdouble bond; length as m-dashO, Psingle bondO−, (Psingle bondOsingle bondP)AS, (Psingle bondOsingle bondP)S and Osingle bondPsingle bondO vibrations respectively. The peak corresponding to Pdouble bond; length as m-dashO, shows red shift with increasing Li2O content indicating depolymerization of phosphate network.